142720389 has 36 divisors (see below), whose sum is σ = 253928844. Its totient is φ = 76753152.

The previous prime is 142720387. The next prime is 142720399. The reversal of 142720389 is 983027241.

142720389 is a `hidden beast` number, since 1 + 4 + 272 + 0 + 389 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 42380100 + 100340289 = 6510^2 + 10017^2 .

It is not a de Polignac number, because 142720389 - 2¹ = 142720387 is a prime.

It is a super-2 number, since 2×142720389² = 40738218872622642, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142720387) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2022 + ... + 17015.

It is an arithmetic number, because the mean of its divisors is an integer number (7053579).

Almost surely, 2^142720389 is an apocalyptic number.

It is an amenable number.

142720389 is a deficient number, since it is larger than the sum of its proper divisors (111208455).

142720389 is a wasteful number, since it uses less digits than its factorization.

142720389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19074 (or 19064 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 142720389 is about 11946.5638992976. The cubic root of 142720389 is about 522.5910972624.

The spelling of 142720389 in words is "one hundred forty-two million, seven hundred twenty thousand, three hundred eighty-nine".